Hi,

Have you used any termination resistor until now? Would you please describe your circuit detail so that others can give you helpful advices?


Best regards,
Yawei

Equalization is a possible route to improving your signaling as a result of losses in the channel, but I doubt it will solve your problem as this is more an issue of impedance matching.  You could use an RF approach and try to impedance match the bondwire to the external transmission line, from the driver, by use of an on-chip capacitor in a L.  I personally have never done this, but I have wanted to try.  ;D

This would help transmit cleaner signals as well as reduce/terminate returning reflections, without the use of a resistor. (note that most of these techniques are narrowband, so you would need to optimize for the most fundamental frequency of your signal patterns)  To be honest, I stated, I would like to try this out myself sometime, but for now, I see a lot of obstacles towards this approach for digital signaling.

Hi mg777,

The ringing is on differential signal.

I just didn't get your comment on adding a differential resistor on source side. Do you mean adding a differential resistor at the output of LVDS driver?


Thanks for your comments.
SATurn